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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第5期    总第273期    2017年5月

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文章编号:1672-7207(2017)05-1175-07
电弧喷涂铝涂层阳极氧化后表面-截面结构分析
孔德军1, 2,闫保旭1

(1. 常州大学 机械工程学院,江苏 常州,213164;
2. 常州大学 江苏省材料表面科学与技术重点实验室,江苏 常州,213164
)

摘 要: 采用电弧喷涂工艺在S355钢表面制备Al涂层,并对其进行阳极氧化处理,通过SEM,EDS和XRD等技术分析试样表面-截面形貌、化学元素分布和物相组成,探讨氧化膜-Al涂层-基体的结合机理。实验结果表明:阳极氧化膜中Al与O出现富集现象,以Al2O3形式存在;Al与O原子在氧化膜中为高浓度分布,构成氧化膜-Al涂层-基体的复合防腐蚀体系;Al涂层为富Al层,原子含量较高,而基体中Fe原子在界面处发生扩散现象;Al涂层中少量Al原子扩散进入基体,在界面处与Fe反应生成Fe-Al化合物,提高电弧喷涂Al涂层的结合强度。

 

关键词: S355钢;阳极氧化;氧化膜;面扫描;线扫描;腐蚀性能

Analysis of arc sprayed Al coating surface-section structure after anodic oxidation
KONG Dejun1, 2, YAN Baoxu1

1. College of Mechanical Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University,
Changzhou 213164, China

Abstract:The Al coatings was prepared on the surface of S355 steel using arc spraying, which was conducted using a anodic oxidation treatment, the surface and section morphologies, chemical element distribution of surface-section and phase of the obtained Al coating were analyzed by using SEM, EDS, and XRD, respectively, and the bonding mechanism of the anodic oxidized film-Al coating-substrate of S355 steel was discussed. The experimental results show that Al and O of the anodic oxidized film appears the enrichment phenomenon, existing in the form of Al2O3. The Al and O atoms in the oxidized film are distributed with high concentration, and the system of oxidized film-Al coating-base composite corrosion resistant is formed. The Al-rich layer of Al coating has the higher concentration of Al, while the Fe atoms of the substrate is diffused at the bonding interface. A small number of Al atoms in the coating are diffused into the substrate to react with Fe atoms and produce the Fe-Al compounds at the interface, improving bonding strength of arc spray Al coating.

 

Key words: S355 steel; anodic oxidation; oxidized film; plane scan; line scan; corrosion resistance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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